In my opinion, Melberg and Knezevic are the same type. That 5 points is because melberg was a free transfer. Melberg is playing for Aston Villa!! which is not in 7 top England teams and we were in race with Torino!! for Knezevic, none of big teams was in race for Melberg and Knezevic.
And for Alonso, I do think Marchisio (that was typing Error) transfer is better than Alonso. You know why? Because he is younger and can be a better player than Alonso in future. He can be Juve's De Rossi. Still you have hope that he become a better player with zero money you pay for him.
But we all know Alonso is a plus avarage player. Not in rage of Diego, VdV, Xavi, Gerrard, Deco, Lampard, Essien, Flamini, Frings and many more... I can give you a list of 15 midfielders better that Xabi Alonso. Even in Spain National team, Senna was better than him. Do you remember a one outstanding performance by Alonso in Liverpool? I don't. If he was that good, Liverpool wouldn't get Mascherano.
You know what the point is? Our new management rate Juventus with teams like Valencia, Arsenal, Fiorentina, Roma, Liverpool and .... They don't categorize Juve with Real, Barca, Man U, Bayern, Milan and ... They are a average people for very very Big Juventus!
And that's why every player we look for there is none of these teams also in the race. These managers are looking for cheap (Better Free) and B class players. It is obvious! These guys not ambitious. And they are so unexperienced for the job. Especialy Secco and tha's Cobolli Gigli.
Anyway it is just my opinion and sorry because it is not the same as yours!